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VACUUM CASTING

Vacuum casting solutions for functional prototypes and low-volume production parts, from design validation to final product testing. We create production-like components with excellent surface finishes, material flexibility, and consistent quality.

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Vacuum Casting Services

Vacuum casting is ideal for functional prototypes and low-volume production parts, providing production-like materials, smooth surface finishes, accurate details, and consistent quality for product validation and early-stage manufacturing.

Silicone Mold Casting Parts

Prototype casting using silicone molds to reproduce detailed parts with consistent surfaces. Suitable for functional testing and product validation.

Polyurethane Casting Parts

PU casting for prototype components with different hardness and material properties. Suitable for testing product performance before production.

Low-Volume Casting Parts

Small-batch casting for multiple identical components with consistent details. Suitable for bridge production and early market testing.

Vacuum Casting Materials

Polyurethane materials with production-like properties for functional prototypes and low-volume manufacturing.

Material	Typical Grades	Typical Dimensional Tolerance	Notes
ABS-like PU	General rigid polyurethane casting resin	±0.10-0.20 mm	Standard per ISO 2768-m for rigid castings. Suitable for housings, covers, appearance prototypes, and small-batch plastic parts.
PC-like PU	High-strength / transparent or semi-transparent PU options	±0.15-0.25 mm	Standard per ISO 2768-m. Used for covers and transparent functional prototypes; clarity may require post-polishing.
PP-like PU	Flexible/tough polyurethane resin (similar to PP)	±0.20-0.30 mm	Standard per ISO 2768-m. Suitable for snap-fit and flexible prototype parts; offers higher deformation tolerance.
PMMA-like / Clear PU	Optical-grade transparent casting resin	±0.15-0.25 mm	Standard per ISO 2768-m. Ideal for light guides, lenses, display covers, and transparent housings.
Rubber-like PU	Soft durometer polyurethane (50 to 90 Shore A available)	±0.20-0.50 mm	Standard per ISO 2768-m. Used for soft-touch parts, gaskets, and overmolding; thin sections may have higher variation.
High-temperature PU	Heat-resistant PU resin (HDT 70-90°C)	±0.15-0.30 mm	Standard per ISO 2768-m. Suitable for functional validation requiring moderate heat resistance or under-hood exposures.

Vacuum Casting Surface Finishes

Production-like surface finishes help prototype parts achieve the appearance and feel of injection molded components.

Screen Printing

Adds logos, symbols, and graphics to finished prototype parts.

Painting

Provides custom colors and cosmetic finishes for presentation and functional prototypes.

Texture Finish

Applies molded textures similar to production plastic parts for design evaluation.

High Gloss Finish

Creates a smooth glossy appearance for display models and consumer product prototypes.

Matte Finish

Produces a uniform non-reflective surface suitable for functional and engineering prototypes.

Mold Finish

Replicates the surface quality of the master pattern for consistent prototype appearance.

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Vacuum Casting Across Industries

Vacuum casting bridges the gap between prototyping and production, delivering productio-like plastic parts for testing, validation, and low-volume manufacturing.

Vacuum Casting Tolerances & Standards

We apply ISO 2768-m (Medium) as our standard tolerance for silicone-molded parts — balancing surface detail with the natural shrinkage of polyurethane resins. On most molded features, our tooling consistently holds tolerances within the Medium grade limits. Typical cast parts range from ±0.1mm on small features to ±0.5mm on larger or softer geometries. If your design includes critical datum points or metal inserts, mark those requirements clearly on the 2D drawing. We will adjust the master pattern and mold design accordingly. For features requiring tighter control, we can apply additional post-processing or CNC finishing upon request. Note that silicone molds are subject to gradual wear, which may affect tolerance over the life of the mold — we monitor this closely and advise when replacement is needed.

Basic Size Range (mm)	Fine (ISO 2768-f)	Medium (ISO 2768-m)	Coarse (ISO 2768-c)	Very Coarse (ISO 2768-v)
0.5 up to 3	± 0.05mm	± 0.1mm	± 0.2mm	–
over 3 up to 6	± 0.05mm	± 0.1mm	± 0.3mm	± 0.5mm
over 6 up to 30	± 0.1mm	± 0.2mm	± 0.5mm	± 1mm
over 30 up to 120	± 0.15mm	± 0.3mm	± 0.8mm	± 1.5mm
over 120 up to 400	± 0.2mm	± 0.5mm	± 1.2mm	± 2.5mm
over 400 up to 1000	± 0.3mm	± 0.8mm	± 2mm	± 4mm
over 1000 up to 2000	± 0.5mm	± 1.2mm	± 3mm	± 6mm
over 2000 up to 4000	–	± 2mm	± 4mm	± 8mm

Need expert guidance on your custom manufacturing project? Our engineering team can help optimize design for manufacturability, material selection, and process planning — ensuring quality, cost efficiency, and reliable delivery.

Consult Engineering Team

Vacuum Casting Solutions

Vacuum casting provides a practical solution between prototyping and production, delivering functional plastic parts with production-like appearance and material properties. We help companies validate designs before investing in full-scale manufacturing.

Engineering Support from Design to Casting

We provide feedback on part design, material selection, and mold considerations to improve casting results and reduce development risks.

Flexible Low-Volume Production

Ideal for product testing, market evaluation, and small-batch requirements where injection molding is not yet necessary.

Production-Like Prototype Quality

Using silicone molds and polyurethane materials, we create prototypes that closely match the appearance, feel, and performance of final production parts.

Parts Completed in as Fast as 3 Days

Our vacuum casting process can complete prototype parts in as fast as 3 days, helping shorten product testing and validation cycles.

Vacuum Casting FAQs

How do I start a vacuum casting project?

Send your CAD files, material requirements, quantity, and surface finish expectations. Our team will review your design and recommend the best approach.

Can vacuum casting replace injection molding?

Vacuum casting is ideal for prototypes and low-volume production. For high-volume manufacturing, injection molding is usually the more suitable solution.

How many parts can one silicone mold produce?

A silicone mold typically supports multiple prototype parts, with the exact quantity depending on part design, material, and production requirements.

What is the lead time for vacuum casting?

Vacuum casting parts can typically be completed in about 3 days, depending on mold complexity, quantity, and finishing requirements.

What finishes are available for vacuum cast parts?

Options include mold finishes, matte surfaces, polishing, painting, textures, and custom cosmetic finishes.

What accuracy can vacuum casting achieve?

Typical accuracy depends on part size, geometry, material shrinkage, and mold design. Critical dimensions should be reviewed during the design stage.

What materials are available for vacuum casting?

We use polyurethane casting materials with different properties, including rigid, flexible, transparent, and heat-resistant options.

What is vacuum casting used for?

Vacuum casting is commonly used for functional prototypes, product validation, and low-volume production parts requiring production-like materials and finishes.

Join 3000+ Companies That Trust Best Prototypes for Precision Parts

Explore real case studies that showcase how our manufacturing capabilities drive product development from prototype to production.

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CNC Machined Impeller Shaft

5-Axis CNC Milled Aluminum Flange Base

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Submit your CAD files and receive a fast quotation with professional DFM support.

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Email : quote@best-prototypes.com

Address : Block 4, Longguang Innovation Park, Zhen'an East Road

No. 74,Chang'an Town,Dongguan,Guangdong, China

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